NEBRASKA CDL COMBINATION PRACTICE TEST
11.
To be in the proper position for coupling, the fifth wheel should:
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tilted up towards the rear of the tractor.
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be tilted down towards the rear of the tractor.
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have its jaws closed around the shank of the kingpin.
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be level with the ground.
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12.
After supplying air to the trailer brake system, you should check the brake system for crossed air lines by:
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shutting the engine off so you can hear the brakes.
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applying and releasing the trailer brakes and listening for the sound of trailer brakes.
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checking the air brake system pressure gauge for signs of major air loss.
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All of the above.
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13.
Tar in the road pavement rising to the road surface in very hot weather:
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causes the road to become very slippery.
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is very sticky and will slow down your vehicle.
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might get in your engine.
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does not affect the road surface or driving conditions.
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14.
Which of the following is NOT part of a trailer air line system?
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Kingpin
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Service air-line
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Emergency air-line
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Glad hands
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15.
Headlights:
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should not be used when driving at night.
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should be out of adjustment.
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can blind other drivers.
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must be turned on a half hour before sunset to a half hour after sunrise.
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16.
The best way to recognize that your trailer has started to skid is:
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by recognizing tire failure.
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by seeing it in your mirrors.
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by feeling the brakes come on.
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by opening the window and feeling the front of the mirror.
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17.
Who is responsible for inspecting the cargo?
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The driver
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The motor carrier
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The person who loaded and secured the cargo
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The shipper
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18.
If there is a cargo fire in a van or box trailer, you should:
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keep the doors shut.
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keep driving until you reach help.
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open the doors, especially if your cargo contains hazardous materials.
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enlist the help of bystanders.
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19.
Which of the following is NOT part of inspecting the coupling?
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Checking that the locking lever is in the "lock" position
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Making sure the fifth-wheel jaws have closed around the shank of the kingpin.
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Checking for enough clearance between the rear of the tractor frame and the landing gear.
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Making sure there is no space between the upper and the lower fifth-wheel
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20.
If you smell exhaust fumes in the cab, you should:
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stop immediately.
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remember to conduct a post-trip inspection.
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wait for the next stop, then inspect your vehicle.
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open the windows.
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